Abstract
Characterization of the wall pressure field in a turbulent boundary layer is necessary for accurate models to be developed. Measurements of the wall pressure field of a turbulent boundary layer were made in a quiet wind tunnel with flush‐mounted pressure sensors. Bispectral analysis was performed on the resulting digitized data to determine whether frequency phase coupling was present. Bispectral analysis, which is an extension of the commonly used Fourier analysis techniques known as auto‐ and cross‐spectral analysis, identifies three wave phase couplings between frequencies by calculating the expected value of the sum of the phases of three frequencies of interest: B(f1F2) = E{|X(f1)‖X(f2)‖X(f1+2)]| × exp[θ(f1) + θ(f1+2)]}, where |X(f)| and θ(f) are the respective magnitude and phase of the Fourier transform of x(t). Phase coupling can be indicative of nonlinear relationships in a system. [Work supported by DTRC IR/IED Program.]
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